RE: [taigtools] Re: repeatibility and spindle mods
- Ten years ago I suspect you got the older lathe style headstock, and the
older dovetail Z column. The new headstock is a single piece extrusion
that accepts a cartridge style shaft/bearing assembly. The spindle is now
ER16 as opposed to the old ¾-16 like the lathe. It is very stout.
About 5 years ago my friend used a Taig CNC mill as part of his PhD. work.
He had developed a new method of predicting equipment failures (predictive
maintenance) and since bearing failure has been widely studied it provided a
way to compare his method to existing methods. We flushed the grease out of
the bearings and he milled aluminum plate for 12-14 hours a day with the
machine. The headstock was fitted with accelerometers and temperature
sensors (as well as the base of the machine.) With no grease the spindle
would run about 30 hours, noticeable vibration (from a human senses
perspective) was only an issue towards the end of the bearing life. Most of
the bearings failed very quickly and very catastrophically. We put dozens of
bearings in two different spindles over the course of 4 mounts (or so). When
the research was all done I replaced the whole cartridge in both spindles
and still use them, and the machine to this day.
From: email@example.com [mailto:firstname.lastname@example.org] On Behalf
Of Low Compression
Sent: Tuesday, May 14, 2013 10:00 PM
Subject: [taigtools] Re: repeatibility and spindle mods
> The Taig spindle is a well-built unit. Some of the things folks try >touse for a high speed spindle are not well made. You can count out >things
like a Dremel tool or similar hand help tools. PreciseBits does >make some
very precise collets for the Dewalt 611 which is a small >laminate trimming
router. This might be a route worth exploring.
I cannot tell you that all TAIG spindles are built the same but the one that
came with my TAIG CNC mill (probably 10 years old at this point) is a 2-part
extrusion that I pulled off and replaced with a Sherline headstock and motor
I loaned a friend the TAIG headstock to make a grinder and he found that the
spindle is not stiff enough to prevent chatter when grinding. Not a
surprising finding---the headstock is not designed for grinding---but I
think that points up some potential problems when trying for the best
possible finish. Granted, there are other issues with the TAIG, the big one
being backlash with the factory screws and nuts that probably mask the
headstock inadequacies (for super finish work). It is, however, more that
satisfactory for much of the work asked of it.
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